Nitrogen availability, local light regime and leaf rank effects on the amount and sources of N allocated within the foliage of young walnut (Juglans nigra x regia) trees

Frak, Ela; Roux, Xavier Le; Millard, P.; Guillaumie, Sabine; Wendler, Renate

doi:10.1093/treephys/26.1.43

Cited by 20 publications

(7 citation statements)

References 34 publications

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“…Similarly, in this study, most needle growth occurred in spring-summer (67 -91%), supporting the hypothesis that N remobilization is driven by sink strength (Nambiar and Fife, 1987;Nambiar and Fife, 1991). During the second half of the second year (autumn-winter), N uptake increased markedly in relation to N translocation, as has been previously observed in Picea sitchensis (Millard and Proe, 1993) and Juglans nigra × regia (Frak et al, 2005). Millard and Proe (1993) showed that the initial growth of Picea sitchensis was not influenced by current N supply, but rather by N provided during the previous year.…”

Section: Discussionsupporting

confidence: 91%

The influence of N and P supply and genotype on N remobilization in containerized Pinus radiata plants

et al. 2012

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H.E. Bown, M.S. Watt, P.W. Clinton, and E.G. Mason. 2012. The influence of N and P supply and genotype on N remobilization in containerized Pinus radiata plants. Cien. Inv. Agr. 39(3): 505-520. A large proportion of the nitrogen (N) used in the current-year growth of the widely grown plantation species Pinus radiata D. Don is N that was stored in plant tissues the previous year. However, the extent to which an imbalance between levels of phosphorus (P) and N may change the capacity of plants to remobilize N is unknown. In this study, the N remobilization responses of four P. radiata genotypes to a factorial combination of N and P additions were assessed in containerized plants in a two-year greenhouse experiment. N supply was enriched with Sixty-five percent of the plant N content at the end of the first year of growth was remobilized during the second year in the high-N high-P supply treatment, compared to 42-48% for the other N and P addition treatments. The ratio of N uptake to N remobilization was greater for the high-N supply regimes compared to the low-N supply regimes, suggesting that trees may rely progressively more on remobilization than uptake as N fertility declines. Most N remobilization (77%) occurred during the spring-summer periods and coincided with the largest proportion of needle development (80%), suggesting that N remobilization was driven by sink-strength. Old foliage was the main source for internal cycling, while roots were the main sink. Faster-growing genotypes did not exhibit an enhanced capacity for N remobilization, suggesting that genetically induced growth performance is not explained by N internal cycling. In conclusion, trees growing with an abundant and balanced nutrient supply exhibited greater capacity for nitrogen remobilization than trees with N and/or P deficiencies however, faster-growing clones did not exhibit an enhanced capacity for N remobilization.

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Section: Discussionsupporting

confidence: 91%

The influence of N and P supply and genotype on N remobilization in containerized Pinus radiata plants

et al. 2012

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“…The range of plant NDFF found in this study is similar to those reported (5 to 25%) elsewhere (Preston et al 1990;Chang et al 1996;Chang and Preston 2000;Frak et al 2005) but lower than the higher recoveries (up to 43%) noted in other studies (Amponsah et al 2004;Choi, Chang, and Hoi 2005). Total N recovered in the plant-soil system constituted 52% of the applied fertilizer (Table 1).…”

Section: Fertilizer Recovery Vs Soil Retentionsupporting

confidence: 81%

Retranslocation, Plant, and Soil Recovery of Nitrogen‐15 Applied to Bareroot Black Walnut Seedlings

Salifu

Islam

Jacobs

2009

Communications in Soil Science and Plant Analysis

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Although retranslocation or nitrogen (N) derived from plants (NDFP) may account for more than 50% of the annual N demand in new growth of conifer seedlings, the proportional contribution of NDFP vs. current uptake or N derived from fertilizer (NDFF) in new growth of hardwood seedlings is relatively unknown. The current uptake was labeled with ammonium sulfate [( 15 NH 4 ) 2 SO 4 ] at the rate of 1.56 g N plant 21 and reared for 90 days in sand culture under greenhouse conditions, and NDFP vs. NDFF was quantified in new growth of half-sib bareroot black walnut (Juglans nigra L.) seedlings. Nitrogen derived from plants accounted for 68 to 83% of the total N demand in new shoot growth of black walnut seedlings vs. NDFF (17 to 32%). Recovered applied fertilizer was 43% in soil and 9% in plants. The greater proportion of NDFP in new growth demonstrates the importance of retranslocation in meeting early N demand of transplanted black walnut seedlings.

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“…2, left). Nutrient levels in leaves of black walnut seedlings may range from 25 to 30 g Á kg -1 for N, 2 to 3 g Á kg -1 for P, and 13 to 15 g Á kg -1 for K (Frak et al, 2005;Ponder, 2004). Additionally, over 26 g Á kg -1 N, 2.5 g Á kg -1 P, and 13 g Á kg -1 K in leaves may be considered adequate for black walnut seedling growth (Ponder, 2004).…”

Section: Resultsmentioning

confidence: 99%

Response of Grafted Juglans nigra to Increasing Nutrient Availability: Growth, Nutrition, and Nutrient Retention in Root Plugs

Salifu¹,

Jacobs²,

Pardillo³

et al. 2006

HortSci

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We examined growth and nitrogen (N), phosphorus (P), potassium (K), and microelement nutrition of grafted black walnut (Juglans nigra L.) seedlings exposed to increasing nutrient supply and grown in the greenhouse for 18 week. Plants were potted and grafted within the first 4 week, then fertigated once each week for a 7-week period with a varying nutrient solution of 20N–4.4P–16.6K that delivered 0, 1160, 2320, and 4620 mg N/plant. Plants were harvested at week 18. There was a positive mean growth response to increased fertilization, although trends were statistically similar across treatments. Leaf nutrient concentration ranged from 22 to 31 g · kg–1 N, 5 to 14 g · kg–1 P, and 19 to 25 g · kg–1 K. The 2320 mg N/plant treatment increased leaf nutrient content 18% to 86% for N, 33% to 303% for P, and 23% to 58% for K compared with the control. Nitrogen efficiency decreased with increased N supply. Increased nutrient retention in the growing medium at higher fertility suggests root plugs could serve as immediate critical nutrient sources for grafted black walnut seedlings after outplanting. Study results suggests nursery fertilization can be used to improve the nutritional quality of grafted black walnut as well as store nutrients in root plugs for later utilization to benefit early establishment success.

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Nitrogen availability, local light regime and leaf rank effects on the amount and sources of N allocated within the foliage of young walnut (Juglans nigra x regia) trees

Cited by 20 publications

References 34 publications

The influence of N and P supply and genotype on N remobilization in containerized Pinus radiata plants

The influence of N and P supply and genotype on N remobilization in containerized Pinus radiata plants

Retranslocation, Plant, and Soil Recovery of Nitrogen‐15 Applied to Bareroot Black Walnut Seedlings

Response of Grafted Juglans nigra to Increasing Nutrient Availability: Growth, Nutrition, and Nutrient Retention in Root Plugs

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